JP2005147363A - Flow control valve - Google Patents

Flow control valve Download PDF

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JP2005147363A
JP2005147363A JP2003389626A JP2003389626A JP2005147363A JP 2005147363 A JP2005147363 A JP 2005147363A JP 2003389626 A JP2003389626 A JP 2003389626A JP 2003389626 A JP2003389626 A JP 2003389626A JP 2005147363 A JP2005147363 A JP 2005147363A
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Prior art keywords
valve
axial direction
valve member
casing
needle
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Japanese (ja)
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Osamu Yamaguchi
修 山口
Minoru Hishikawa
実 菱川
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Time Engineering Co Ltd
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Time Engineering Co Ltd
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Priority to JP2003389626A priority Critical patent/JP2005147363A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a flow control valve, preventing hysteresis of a needle valve to easily control the flow rate. <P>SOLUTION: This flow control valve 10 is put in the connecting state between an upstream pipeline and a downstream pipeline not shown in figures to thereby regulate the passing quantity of a fluid, and the valve is formed by assembling a valve member 30 and a valve seat member 40 to a casing 20. In this flow control valve 10, in both cases of the valve opening operation and the valve closing operation, the valve member 30 is regulated from causing a very small displacement due to a clearance when upward energizing force is applied thereto from a pushup spring 60, so that in an engagement part 31B, the vertical movement of the valve member 30 is performed with the upper side surface of a male screw and the lower side surface of a female screw always abutted on each other not to generate a difference between the rotating position of the rotary part 31 and the height of the valve member 30. Thus, it is possible to restrain hysteresis caused between rising and lowering of the valve member 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、流量制御弁に関する。   The present invention relates to a flow control valve.

例えば特許文献１に示すように、弁体を上下動させて弁体の先端に設けられたニードル弁をケーシングの弁座に接離させることで、流量を調整する流量制御弁がある。このような流量制御弁では、ケーシング側にねじ孔（雌ねじ）が設けられると共に、弁体側には、ねじ孔に螺合可能な雄ねじが設けられた動略伝達機構が用いられている。そして、ケーシングに螺合させた弁体を回動させると、ねじ孔と雄ねじとのねじ送り作用により、弁体の上下動が行われるようになっている。
特開平８−２１５５６号公報（第１図） For example, as shown in Patent Document 1, there is a flow control valve that adjusts the flow rate by moving a valve body up and down and moving a needle valve provided at the tip of the valve body to and away from a valve seat of a casing. In such a flow control valve, a movement transmission mechanism is used in which a screw hole (female screw) is provided on the casing side, and a male screw that can be screwed into the screw hole is provided on the valve body side. When the valve body screwed into the casing is rotated, the valve body is moved up and down by the screw feeding action of the screw hole and the male screw.
JP-A-8-21556 (FIG. 1)

このようなねじ送りを利用した流量制御弁は、ねじのピッチ間の隙間のため、ニードル弁をねじ送りする場合、行き（ねじ込み）と帰り（ねじ抜き）とで弁体の回動位置が同じであったとしても、ニードル弁の高さ位置がずれてしまう、いわゆるヒステリシスが生じてしまう。このため、流量の制御が困難になるという問題があった。
また、上記のようなねじ送り作用を利用しないものであっても、弁体を上下動させる動力伝達機構を備えたものでは寸法誤差等に起因して上下動の軸方向に沿ったクリアランス（いわゆる「遊び」）が保有されることで、上記のようなヒステリシスに起因する流量の制御が困難になる問題があった。
本発明は上記のような事情に基づいて完成されたものであって、ニードル弁のヒステリシスを防止して流量の制御を容易にすることが可能な流量制御弁を提供することを目的とする。 In such a flow control valve using screw feed, because of the gap between the pitches of the screws, when the needle valve is screw fed, the turning position of the valve body is the same for going (screwing) and returning (screwing). Even so, a so-called hysteresis occurs in which the height position of the needle valve is shifted. For this reason, there existed a problem that control of flow volume became difficult.
Even if the screw feeding action as described above is not used, a clearance provided along the axial direction of the vertical movement due to a dimensional error or the like (so-called clearance) (so-called so-called clearance) The possession of “play”) makes it difficult to control the flow rate due to the hysteresis as described above.
The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a flow rate control valve capable of facilitating the flow rate control by preventing the hysteresis of the needle valve.

上記の目的を達成するための手段として、請求項１の発明は、内部に流体の流路が形成されたケーシングと、前記流路の途中に形成された弁座と、この弁座に対し接近あるいは離間することにより前記流体の通過面積を調整可能なニードル弁を備えた弁部材と、この弁部材を軸方向に沿って往復動可能な駆動源とを備え、この駆動源から前記弁部材に対する動力伝達機構中に前記軸方向に沿ったクリアランスが保有されることで前記弁部材に前記クリアランス分に起因した微小変位が発生するものにおいて、前記弁部材に対し前記軸方向の一方向に作用して前記クリアランスを解消させる付勢手段が設けられているところに特徴を有する。   As a means for achieving the above object, the invention of claim 1 is characterized in that a casing having a fluid flow path formed therein, a valve seat formed in the middle of the flow path, and approaching the valve seat. Alternatively, a valve member including a needle valve capable of adjusting the passage area of the fluid by being separated and a drive source capable of reciprocating the valve member along the axial direction, the drive source from the drive member to the valve member. When the clearance along the axial direction is held in the power transmission mechanism, the valve member causes a minute displacement due to the clearance, and acts on the valve member in one axial direction. And a biasing means for eliminating the clearance is provided.

請求項２の発明は、請求項１に記載のものにおいて、前記動力伝達機構は、前記ケーシングに前記軸方向に沿って形成されたねじ孔と前記ねじ孔に対し前記クリアランスを保有しつつねじ込まれ前記駆動源によってねじ孔内を螺進あるいは螺退可能な移動体とからなるとともに、前記弁部材はこの移動体とは前記軸方向に沿って連動可能であるところに特徴を有する。   According to a second aspect of the present invention, in the first aspect of the present invention, the power transmission mechanism is screwed in a screw hole formed in the casing along the axial direction and the clearance with respect to the screw hole. The moving member is configured to be movable or screwable in the screw hole by the driving source, and the valve member is characterized in that it can be interlocked with the moving member along the axial direction.

請求項３の発明は、請求項２に記載のものにおいて、前記ケーシングの内部には前記流路に連通し前記軸方向に沿った装着孔が形成される一方、前記弁部材には同弁部材の軸方向の移動を許容しつつ前記装着孔内を前記ニードル弁を収容する弁収容室と前記移動体側を収容する機構室とに区画するシール手段が備えられているところに特徴を有する。   According to a third aspect of the present invention, in the second aspect of the present invention, a mounting hole is formed in the casing so as to communicate with the flow path and extend along the axial direction. It is characterized in that seal means for partitioning the inside of the mounting hole into a valve accommodating chamber for accommodating the needle valve and a mechanism chamber for accommodating the movable body side while allowing the movement in the axial direction is provided.

請求項４の発明は、請求項１ないし請求項３のいずれかに記載のものにおいて、前記弁座は前記ケーシングと別体に設けられると共に、前記ケーシングに対して前記弁部材の軸方向に移動可能に組みつけられるところに特徴を有する。   According to a fourth aspect of the present invention, the valve seat is provided separately from the casing and moves in the axial direction of the valve member with respect to the casing. It has a feature where it can be assembled.

請求項５の発明は、請求項４にきさいのものにおいて、前記弁座は前記ケーシングに設けられたねじ孔との螺合動作によって前記弁部材の軸方向に移動可能となるところに特徴を有する。   According to a fifth aspect of the present invention, the valve seat according to the fourth aspect is characterized in that the valve seat is movable in the axial direction of the valve member by a screwing operation with a screw hole provided in the casing. Have.

＜請求項１の発明＞
弁部材のクリアランスを解消させる付勢手段が設けられているので、弁部材の行きと帰りとニードル弁の位置がずれてしまう、いわゆるヒステリシスが生ずることを防止して、流量の制御を容易にすることが可能となる。 <Invention of Claim 1>
Since the biasing means for eliminating the clearance of the valve member is provided, it is possible to prevent the so-called hysteresis that causes the position of the needle valve from deviating from the return and return of the valve member, thereby facilitating the flow rate control. It becomes possible.

＜請求項２の発明＞
ケーシングに設けられたねじ孔内を螺進あるいは螺退可能な移動体と連動可能である弁部材をそなえたものにおいて、ねじ孔と移動体との間のクリアランスを解消しながら弁部材の移動ができるので、ヒステリシスを解消して流量の制御が容易に可能となる。 <Invention of Claim 2>
In the case where a valve member that can be interlocked with a movable body that can be screwed or screwed in the screw hole provided in the casing is provided, the valve member can be moved while eliminating the clearance between the screw hole and the movable body. Therefore, the hysteresis can be eliminated and the flow rate can be easily controlled.

＜請求項３の発明＞
移動体を収容する機構室とニードル弁を収容する弁収容室との間のシールが可能となる。 <Invention of Claim 3>
Sealing between the mechanism chamber that houses the moving body and the valve chamber that houses the needle valve is possible.

＜請求項４の発明＞
ケーシングに対して別体の弁座が弁部材の軸方向に移動可能に組付けられるので、弁部材と弁座との位置の調整が容易にできる。 <Invention of Claim 4>
Since the separate valve seat is assembled to the casing so as to be movable in the axial direction of the valve member, the position of the valve member and the valve seat can be easily adjusted.

＜請求項５の発明＞
弁座と弁部材との位置の調整が、弁座をケーシングのねじ孔へのねじ込み動作で可能となるので、調整が容易となる。 <Invention of Claim 5>
Since the position of the valve seat and the valve member can be adjusted by screwing the valve seat into the screw hole of the casing, the adjustment becomes easy.

本発明の一実施形態を図１ないし図７によって説明する。
本実施形態の流量制御弁１０は、図示しない上流側配管と下流側配管との間に接続されて流体の通過量を調整するものであり、ケーシング２０に対して弁部材３０と弁座部材４０とを組付けてなるものである。 An embodiment of the present invention will be described with reference to FIGS.
The flow control valve 10 of the present embodiment is connected between an upstream pipe and a downstream pipe (not shown) to adjust the amount of fluid that passes through the valve 20 and the valve seat member 40 with respect to the casing 20. Is assembled.

ケーシング２０は弁部材装着孔２１と弁座部材装着孔２２とが上下方向に貫通形成されると共に、ケーシング２０の側面から穿孔されて弁部材装着孔２１に通じる上流側配管接続孔２３とケーシング２０の側面において前記上流側配管接続孔２３とは反対側から穿孔されて弁座部材装着孔２２に通じる下流側配管接続孔２４とが形成されている。
また、弁部材装着孔２１は、後述のナット部材２５が嵌入される機構室２１Ａとニードル部３５が嵌入される弁収容室２１Ｂとからなっている。 In the casing 20, a valve member mounting hole 21 and a valve seat member mounting hole 22 are formed so as to penetrate in the vertical direction, and an upstream side pipe connection hole 23 and a casing 20 that are drilled from the side surface of the casing 20 and communicate with the valve member mounting hole 21. On the other side, a downstream side pipe connection hole 24 that is drilled from the side opposite to the upstream side pipe connection hole 23 and communicates with the valve seat member mounting hole 22 is formed.
The valve member mounting hole 21 includes a mechanism chamber 21A in which a nut member 25 (to be described later) is inserted and a valve storage chamber 21B in which the needle portion 35 is inserted.

弁部材３０は駆動装置Ｍによって回動及び軸方向（図１の上下方向）に沿って移動可能となる回動部３１と、回動部３１からは軸方向に沿った押圧力のみを受ける受部３２と、受部３２からの押圧を受けてケーシング２０に組み付けられた弁座部材４０の開閉量の調整を行うニードル部３５とから構成される。   The valve member 30 is rotated by the driving device M and can be moved along the axial direction (vertical direction in FIG. 1), and the rotary member 31 receives only a pressing force along the axial direction. It comprises a portion 32 and a needle portion 35 that adjusts the opening / closing amount of the valve seat member 40 assembled to the casing 20 upon receiving a pressure from the receiving portion 32.

回動部３１は、全体略円柱状で、上半部がその外周面にセレーションが設けられた嵌合部３１Ａをなす一方、駆動装置Ｍの駆動軸Ｓも、内周面に嵌合部３１Ａのセレーション形状に合わせた溝が上下方向に亘って形成された略円筒形状をなしていて、これらがかみ合わされることにより回動部３１は、駆動軸Ｓと一体回転可能でかつ上下方向に移動可能となっている。
また、回動部３１の下半部がその外周面に雄ねじが螺設された螺合部３１Ｂをなす構成であり、螺合部３１Ｂはケーシング２０に固定されるナット部材２５に螺合されるようになっている。ナット部材２５は、内周に螺合部３１Ｂの雄ねじと螺合可能なねじ孔（雌ねじ）が形成された略筒状をなしていると共に、水平断目がＤ字形状に形成されてケーシング２０の機構室２１Ａ内に回転不能に固定されている。従って、回動部３１が回転すると螺合部３１Ｂはナット部材２５のねじ溝に沿って上下方向に螺旋移動されることで、回動部３１全体が上下動されるようになっている。
ところで、螺合部３１Ｂ及びナット部材２５にもうけた雄ねじ及び雌ねじはリード角を大きくした多条ねじとすることで、螺合部３１Ｂの軸方向の荷重を受けるとその荷重方向に沿って容易に螺進或いは螺退可能となっている。本実施形態では、リード角が１５度に設定されていると共に、後述の押し上げばね６０からの付勢力によって螺合部３１Ｂは上方への螺退動作が可能となっている。
その一方、駆動装置Ｍはブレーキ機構を備えたモータ（例えばギヤードモータ）が用いられており、駆動装置Ｍを停止させると駆動軸Ｓは回転不能に保持される。そして、回動部３１は嵌合部３１Ａがこの駆動軸Ｓと嵌合されて、駆動軸Ｓが回転しない限り嵌合部３１Ａの回転が規制されるようになっており、すなわち回動部３１は駆動装置Ｍによって回り止めされるようになっている。
尚、回動部３１を螺合したナット部材２５は、ケーシング２０の弁部材装着孔２１に挿入されてからビス止めされた蓋板２６によって抜止がされるようになっている（図１参照）。 The rotating part 31 has a substantially cylindrical shape as a whole, and the upper half part forms a fitting part 31A in which serrations are provided on the outer peripheral surface thereof, while the drive shaft S of the driving device M also has a fitting part 31A on the inner peripheral face. Grooves matching the serration shape are formed in a substantially cylindrical shape formed in the vertical direction, and when these are engaged, the rotating portion 31 can rotate integrally with the drive shaft S and move in the vertical direction. It is possible.
Further, the lower half portion of the rotating portion 31 is configured to form a screwed portion 31B in which a male screw is screwed on the outer peripheral surface, and the screwed portion 31B is screwed into a nut member 25 fixed to the casing 20. It is like that. The nut member 25 has a substantially cylindrical shape in which a screw hole (female screw) that can be screwed with the male screw of the screwing portion 31B is formed on the inner periphery, and a horizontal break is formed in a D-shape to form the casing 20. The mechanism chamber 21A is fixed so as not to rotate. Therefore, when the rotating part 31 rotates, the screwing part 31B is spirally moved in the vertical direction along the thread groove of the nut member 25, so that the entire rotating part 31 is moved up and down.
By the way, the male screw and the female screw provided on the screwing portion 31B and the nut member 25 are multi-threaded screws having a large lead angle, so that when the load in the axial direction of the screwing portion 31B is received, it is easily along the load direction. It can be screwed or unscrewed. In this embodiment, the lead angle is set to 15 degrees, and the screwing portion 31B can be screwed upward by a biasing force from a push-up spring 60 described later.
On the other hand, a motor (for example, a geared motor) provided with a brake mechanism is used as the drive device M, and when the drive device M is stopped, the drive shaft S is held unrotatable. The rotating portion 31 is configured such that the fitting portion 31A is fitted with the drive shaft S and the rotation of the fitting portion 31A is restricted unless the driving shaft S rotates. Is prevented from rotating by the driving device M.
The nut member 25 screwed to the rotating portion 31 is prevented from being removed by a cover plate 26 which is screwed after being inserted into the valve member mounting hole 21 of the casing 20 (see FIG. 1). .

受部３２は全体略円柱状をなすと共に、上端面中央部には、円形断面の凹部３４Ａが設けられ、ここには金属製のボール３３が収容されている。尚、凹部３４Ａの開口端には、ボールを収容する前には円筒状に押え壁３４Ｂが形成されていて、ボール３３が収容された後に、この押え壁３４Ｂがかしめられることにより、ボール３３は遊転が可能な状態で抜止がなされている。従って、受部３２は回転しながら下降する回動部３１から押圧されると、ボール３３が回転することにより回動部３１からは押圧力のみを受けるため、受部３２は回転せずにケーシング２０の下方へ移動するようになっている。   The receiving portion 32 has a substantially cylindrical shape as a whole, and a concave portion 34A having a circular cross section is provided at the center of the upper end surface, in which a metal ball 33 is accommodated. Note that a holding wall 34B is formed in a cylindrical shape at the opening end of the recess 34A before the ball is received. After the ball 33 is received, the holding wall 34B is caulked, whereby the ball 33 is It is secured so that it can be idle. Accordingly, when the receiving portion 32 is pressed from the rotating portion 31 that descends while rotating, the ball 33 rotates, so that only the pressing force is received from the rotating portion 31, so that the receiving portion 32 does not rotate and the casing 32 does not rotate. 20 is moved downward.

受部３２は、ニードル部３５（詳細後述）のニードル保持部３６との間にシール手段（ベロフラム５０）を挟み込んでいる。
ベロフラム５０は、外周縁部が肉厚となってナット部材２５の下端とケーシング２０との間で圧縮状態で挟み付けられている。また、この肉厚部分より内周側は薄膜状となっており、機構室２１Ａと弁収容室２１Ｂとを水密状態で区画することができる。さらに、この薄膜部分は受部３２の外周部に十分な弛みが保有されていて、受部３２の上下動に追従した変位が許容されるようになっている。
一方、ニードル保持部３６の上端面には上面凹部３６Ａが凹設されていて、ベロフラム５０と共に受部３２の下端部が嵌め込まれている。
そして、ニードル保持部３６は、その下端側に配された後述する押し上げばね（付勢手段）６０の付勢力によって、ベロフラム５０及び受部３２と分離しないよう、一体的な関係（連動可能な関係）が保たれるようになっている。 The receiving portion 32 sandwiches a sealing means (Bellofram 50) between a needle holding portion 36 of a needle portion 35 (details will be described later).
The belofram 50 is sandwiched in a compressed state between the lower end of the nut member 25 and the casing 20 with the outer peripheral edge portion being thick. Further, the inner peripheral side of the thick portion is a thin film, and the mechanism chamber 21A and the valve storage chamber 21B can be partitioned in a watertight state. Further, the thin film portion has sufficient slackness in the outer peripheral portion of the receiving portion 32 so that displacement following the vertical movement of the receiving portion 32 is allowed.
On the other hand, an upper surface concave portion 36 </ b> A is formed in the upper end surface of the needle holding portion 36, and the lower end portion of the receiving portion 32 is fitted together with the bellophram 50.
The needle holding portion 36 is integrated with the bellowram 50 and the receiving portion 32 so that the needle holding portion 36 is not separated from the bellowram 50 and the receiving portion 32 by a biasing force of a later-described push-up spring (biasing means) 60 disposed on the lower end side. ) Is maintained.

ニードル部３５は、ニードル保持部３６内にニードル弁３７を組付けて構成される。
ニードル保持部３６は上部側を閉じた円筒形状をなし、内部が下方へ向けて開口する収容部３６Ｂとなっていて、収容部３６Ｂはその内部にニードル弁３７を収容可能となっている。
ニードル弁３７は、先端部に針状の弁部３７Ａが形成され、弁部３７Ａの上方には中央やや上方にフランジ３７Ｃを備えた円柱状部３７Ｂが連なる形状となっている。ニードル保持部３６内には衝撃吸収用即ちニードル弁３７が弁座４１Ａに突き当てられたときの衝撃を吸収するためのニードルバネ３８が収容されている。ニードルバネ３８はフランジ３７Ｃとニードル保持部３６の奥壁との間に介在されていて、ニードル弁３７を下方へ付勢している。
尚、ニードル保持部３６はニードル弁３７を収容後、中央にニードル弁３７の挿通孔３９Ａが穿設された抑板３９でもって閉じられ、ニードル弁３７の抜止がなされるようになっている。具体的には、抑板３９はニードル保持部の下端面から下方に延出形成された円筒状の先端縁をかしめ付けることによって固着されるようになっている。 The needle part 35 is configured by assembling a needle valve 37 in the needle holding part 36.
The needle holding portion 36 has a cylindrical shape with the upper side closed, and has an accommodating portion 36B that opens downward, and the accommodating portion 36B can accommodate a needle valve 37 therein.
The needle valve 37 is formed with a needle-like valve portion 37A at the tip, and a cylindrical portion 37B having a flange 37C slightly above the center above the valve portion 37A. The needle holding portion 36 accommodates a needle spring 38 for absorbing an impact, that is, for absorbing an impact when the needle valve 37 is abutted against the valve seat 41A. The needle spring 38 is interposed between the flange 37C and the back wall of the needle holding portion 36, and urges the needle valve 37 downward.
After the needle valve 37 is accommodated, the needle holding portion 36 is closed by a restraining plate 39 having an insertion hole 39A of the needle valve 37 formed in the center, and the needle valve 37 is prevented from being pulled out. Specifically, the restraining plate 39 is fixed by caulking a cylindrical tip edge that extends downward from the lower end surface of the needle holding portion.

また、ニードル保持部３６の断面形状は、図５に示すように四隅が面取りされた形状となっていると共に、ケーシング２０の弁収容室２１Ｂのうちニードル部３５が収容される箇所の断面形状は図５の左右両面をニードル保持部３６の面取り形状に合わせて内周側に突出させた平面部分が設けられているので、ニードル保持部３６はケーシング２０内で回転不能でかつ上下動のみ許容された状態で収容される。   Further, the cross-sectional shape of the needle holding portion 36 is a shape in which the four corners are chamfered as shown in FIG. 5, and the cross-sectional shape of the portion where the needle portion 35 is accommodated in the valve accommodating chamber 21 </ b> B of the casing 20 is 5 is provided with a planar portion that protrudes toward the inner peripheral side in accordance with the chamfered shape of the needle holding portion 36, the needle holding portion 36 is not rotatable in the casing 20 and only allowed to move up and down. It is housed in the state.

弁座部材４０はケーシング２０への取付のための支持部４２とその上部側に連設された円筒部４１とからなっている。
支持部４２は弁座部材装着孔２２に対しシール用のＯリング４６を介して挿入されると共に、下端部に形成されたねじ部にロックナット４５を締め込むことによって弁座部材４０全体の固定がなされている。
また、円筒部４１の上端から軸心に沿って支持部４２に至るまでの所定深さ範囲に亘り、軸孔４１Ｍが穿孔されている。さらに、円筒部４１は支持部４２より小径に形成されていて、支持部４２との境界部周りには下流側配管接続孔２４に連通する下部連通空間２４Ａが環状に形成されている。これによって円筒部４１において等間隔毎に貫通して形成された４つの挿通孔部４４を介して、下部連通空間２４Ａと軸孔４１Ｍとがそれぞれ連通される。
また、円筒部４１において挿通孔部４４より上部側には案内管部４３が形成されている。ケーシング２０における案内管部４３の外周には上流側配管接続孔２３に連通する上部連通空間２３Ａが環状に設けられており、これによって、案内管部４３において等間隔毎に貫通して形成された４つの貫孔４３Ａを介して上部連結孔空間２３Ａとが連通している。 The valve seat member 40 is composed of a support portion 42 for attachment to the casing 20 and a cylindrical portion 41 connected to the upper portion thereof.
The support portion 42 is inserted into the valve seat member mounting hole 22 via a sealing O-ring 46, and the lock seat 45 is fastened to a screw portion formed at the lower end portion to fix the valve seat member 40 as a whole. Has been made.
Further, a shaft hole 41M is drilled over a predetermined depth range from the upper end of the cylindrical portion 41 to the support portion 42 along the axis. Further, the cylindrical portion 41 is formed to have a smaller diameter than the support portion 42, and a lower communication space 24 </ b> A communicating with the downstream side pipe connection hole 24 is formed in an annular shape around the boundary portion with the support portion 42. Accordingly, the lower communication space 24A and the shaft hole 41M are communicated with each other through the four insertion hole portions 44 formed so as to penetrate the cylindrical portion 41 at equal intervals.
In addition, a guide tube portion 43 is formed on the cylindrical portion 41 above the insertion hole portion 44. An upper communication space 23 </ b> A communicating with the upstream side pipe connection hole 23 is annularly provided on the outer periphery of the guide pipe portion 43 in the casing 20, and thereby, the guide pipe portion 43 is formed to penetrate at equal intervals. The upper connecting hole space 23A communicates with the four through holes 43A.

ところで、軸孔４１Ｍの上端からはニードル弁３７が同心で挿入されている。そして、案内管部４３はニードル弁３７の円柱状部３７Ｂがほぼ隙間なく挿入可能に形成され、このことによって、ニードル弁３７の昇降動作がガイドされるようになっている。
また、軸孔４１Ｍは貫孔４３Ａの下端部側に設けられた環状の段差面４１Ａによって径が大小変化している。ここには、ニードル弁３７の弁部３７Ａが挿入されるようになっており、ニードル弁３７の昇降動作がなされると、弁部３７Ａと段差面４６との間の環状の隙間の面積が変化する。即ち、上記した段差面４１Ａがニードル弁３７の弁座４１Ａを構成することになり、ニードル弁３７の昇降により、弁部３７Ａは弁座４１Ａの円周面と密着する状態と径方向内側へ所定間隔だけ離れた状態との間を変位して流体流量を制御する。 Incidentally, the needle valve 37 is inserted concentrically from the upper end of the shaft hole 41M. The guide tube portion 43 is formed so that the columnar portion 37B of the needle valve 37 can be inserted with almost no gap, and thereby, the raising and lowering operation of the needle valve 37 is guided.
Further, the diameter of the shaft hole 41M is changed by the annular step surface 41A provided on the lower end side of the through hole 43A. Here, the valve portion 37A of the needle valve 37 is inserted, and when the needle valve 37 is moved up and down, the area of the annular gap between the valve portion 37A and the step surface 46 changes. To do. That is, the above-described stepped surface 41A constitutes the valve seat 41A of the needle valve 37, and by raising and lowering the needle valve 37, the valve portion 37A is in close contact with the circumferential surface of the valve seat 41A and is radially inward. The fluid flow rate is controlled by displacing between the states separated by an interval.

ここで、前述したように、螺合部３１Ｂとナット部材２５とはねじによる嵌め合いがなされている。
具体的には螺合部３１Ｂの外周面に雄ねじが形成され、ナット部材２５の内周面に雌ねじが形成されているが、厳密には雄ねじと雌ねじとの間には軸方向（上下方向）にクリアランスが保有されている。一方螺合部３１Ｂには、ニードル保持部３６、ベロフラム５０、受部３２及びボール３３を介して押し上げばね６０の付勢力が作用している。
このため、螺合部３１Ｂは常に上方へ押し上げられた状態に付勢されていることから、上記した雌雄のねじ間では下側にクリアランス（図７中符号Ｃにて示す箇所）を保有し、上側が密着した状態に常に保持される（図７参照）。また、螺合部３１Ｂのねじ込み方向（図７中矢印Ｐにて示す方向）に関してみれば、雄ねじのねじ込み方向の前面側が当接した状態となり、ねじ込み方向後面側にクリアランスを保有することとなる。さらに、螺合部３１Ｂに上方への付勢力が作用すると螺合部３１Ｂは上方への螺退動作を行うようになっているが、回動部３１の嵌合部３１Ａは駆動装置Ｍの駆動軸Ｓによって回り止めされていて、嵌合部３１Ａのセレーションは、図８に示すように駆動軸Ｓの図示Ｑの方向（螺合部３１Ｂを螺進動作させるための回転方向）側の面が当接した状態に常に保持される。従って、駆動装置Ｍの正逆転による螺合部３１Ｂの螺進・螺退のいずれの動作時においても、雌雄ねじ同士上下の位置関係は常に一定となる。
このことが、ひいては、駆動装置Ｍの正逆転に伴なってニードル弁３７の昇降動作にヒステリシスを生じさせない結果を生む。 Here, as described above, the screwing portion 31B and the nut member 25 are fitted with screws.
Specifically, a male screw is formed on the outer peripheral surface of the threaded portion 31B, and a female screw is formed on the inner peripheral surface of the nut member 25. Strictly speaking, an axial direction (vertical direction) is provided between the male screw and the female screw. Clearance is held. On the other hand, the urging force of the push-up spring 60 acts on the threaded portion 31 </ b> B via the needle holding portion 36, the bellophram 50, the receiving portion 32, and the ball 33.
For this reason, since the screwing portion 31B is always urged to be pushed upward, it has a clearance (a portion indicated by symbol C in FIG. 7) on the lower side between the male and female screws. The upper side is always held in close contact (see FIG. 7). Further, regarding the screwing direction of the screwing portion 31B (the direction indicated by the arrow P in FIG. 7), the front side in the screwing direction of the male screw is in contact, and clearance is retained on the rear side in the screwing direction. Further, when an upward urging force is applied to the screwing part 31B, the screwing part 31B performs an upward screwing operation, but the fitting part 31A of the rotating part 31 is driven by the driving device M. As shown in FIG. 8, the serration of the fitting portion 31A is prevented from rotating by the shaft S, and the surface of the drive shaft S in the direction Q (rotation direction for screwing the screwing portion 31B) as shown in FIG. Always kept in contact. Accordingly, the upper and lower positional relationship between the male and female screws is always constant in both the screwing and screwing operations of the screwing portion 31B by forward and reverse rotation of the driving device M.
This in turn results in no hysteresis in the ascending / descending operation of the needle valve 37 with the forward / reverse rotation of the driving device M.

続いて、本実施形態の流量制御弁１０の動作について説明する。
図１に示す状態から駆動装置Ｍの駆動軸Ｓを正転させると、回動部３０が駆動軸Ｓと共に正転し螺合部３１Ｂの螺進動作によって回動部３０が下方へ移動する。すると、回動部３０の下方への押圧力がボール３３、受部３２、ベロフラム５０及びニードル部３５へ伝達することで弁部材３０全体が下降する。そして、ニードル弁３７の弁部３７Ａが弁座へ当接するまで、弁部材を下降させる（図４参照）。このとき、弁部材３０が最下端の位置にあって、ニードル弁３７の弁部３７Ａが円筒部４１の弁座４１Ａに当接した状態では、上流側から下流側への流体の通過は不能となっており、この状態が「閉弁状態」である。尚、本実施形態の流量制御弁１０では、ニードル弁３７が円筒部４１に当接した状態でも、ニードルバネ３８の弾性により上方への移動が可能であるので、ニードル弁３７の弁部３７Ａが円筒部４１の弁座４１Ａに当接して機械的にロックしてしまう、いわゆるメカニカルロックの回避が可能となっている。
一方、閉弁状態から駆動装置Ｍの駆動軸Ｓを逆転させると、回動部３１が駆動軸Ｓと共に逆転し螺合部３１Ｂの螺退動作によって回動部３０が上方へ移動する。すると、押し上げばね６０が上方への付勢力をニードル部３５に作用させ、ニードル部３５と受部３１との間でベロフラム５０を挟み込んだ状態を保持したまま弁部材３０は一体となって上昇する。弁部材３０が上昇すると、ニードル弁３７の弁部３７Ａと弁座４１Ａとの間に隙間が生じて流体が上流側から下流側へ通過可能となる（このときの状態を「開弁状態」という）。 Then, operation | movement of the flow control valve 10 of this embodiment is demonstrated.
When the drive shaft S of the drive device M is rotated forward from the state shown in FIG. 1, the rotating portion 30 rotates forward together with the drive shaft S, and the rotating portion 30 moves downward by the screwing operation of the screwing portion 31B. Then, the downward pressing force of the rotating portion 30 is transmitted to the ball 33, the receiving portion 32, the bellowram 50, and the needle portion 35, so that the entire valve member 30 is lowered. Then, the valve member is lowered until the valve portion 37A of the needle valve 37 contacts the valve seat (see FIG. 4). At this time, when the valve member 30 is at the lowermost position and the valve portion 37A of the needle valve 37 is in contact with the valve seat 41A of the cylindrical portion 41, fluid cannot be passed from the upstream side to the downstream side. This state is the “valve closed state”. In the flow control valve 10 of the present embodiment, the needle valve 37 can be moved upward by the elasticity of the needle spring 38 even when the needle valve 37 is in contact with the cylindrical portion 41, so that the valve portion 37A of the needle valve 37 is cylindrical. It is possible to avoid a so-called mechanical lock that comes into contact with the valve seat 41A of the portion 41 and mechanically locks.
On the other hand, when the drive shaft S of the drive device M is reversely rotated from the valve-closed state, the rotating portion 31 is reversely rotated together with the drive shaft S, and the rotating portion 30 is moved upward by the screwing operation of the screwing portion 31B. Then, the push-up spring 60 causes an upward biasing force to act on the needle portion 35, and the valve member 30 ascends integrally while maintaining the state in which the bellophram 50 is sandwiched between the needle portion 35 and the receiving portion 31. . When the valve member 30 is raised, a gap is generated between the valve portion 37A of the needle valve 37 and the valve seat 41A, and the fluid can pass from the upstream side to the downstream side (this state is referred to as an “open valve state”) ).

ここで、本実施形態の流量制御弁１０では、弁部材３０が上昇又は下降のいずれの場合にも、弁部材３０には押し上げばね６０から上方への付勢力が作用しているので、図７に示すように、螺合部３１Ｂとナット部材２５との螺合において、雄ねじの上側面（ねじ込み方向に関する前面）と雌ねじの下側面とが常に当接した状態で螺進又は螺退動作が行われ、雄ねじと雌ねじとの間では軸方向下側（ねじ込み方向に関する後面側）にのみクリアランスを保有した状態となり、軸方向上側（及びねじ込み方向に関する前面側）にはクリアランスがほぼない状態となっている。さらに、押し上げばね６０から上方への付勢力が作用した螺合部３１Ｂは上方への螺退動作を行うようになっているが、駆動装置Ｍが回り止めとなっているので、駆動装置Ｍの駆動軸Ｓと回動部３１の嵌合部３１Ａとのセレーションの回動方向に関する嵌合面にも図８に示すようにクリアランスがほぼない状態となる。
これにより、駆動装置Ｍの正転時、逆転時のいずれの場合においても、回動部３１の高さ位置に差異が生じないことになり、即ち、このことが駆動装置Ｍの正逆転とニードル弁３７の高さ位置が変化しないことを意味する。従って、弁部材３０の上昇時と下降時との間に生ずるヒステリシスの抑制が可能となる。 Here, in the flow control valve 10 of the present embodiment, the upward biasing force from the push-up spring 60 acts on the valve member 30 regardless of whether the valve member 30 is raised or lowered. As shown in FIG. 4, when the screwed portion 31B and the nut member 25 are screwed, the screw threading or screwing operation is performed in a state where the upper surface of the male screw (front surface in the screwing direction) and the lower surface of the female screw are always in contact with each other. However, the clearance between the male screw and the female screw is maintained only on the lower side in the axial direction (the rear side with respect to the screwing direction), and there is almost no clearance on the upper side in the axial direction (and the front side with respect to the screwing direction). Yes. Further, the screwing portion 31B to which the upward biasing force is applied from the push-up spring 60 performs an upward screwing operation, but the drive device M is prevented from rotating, so that the drive device M As shown in FIG. 8, there is almost no clearance on the fitting surface related to the rotation direction of the serration between the drive shaft S and the fitting portion 31 </ b> A of the turning portion 31.
As a result, there is no difference in the height position of the rotating unit 31 in both cases of forward rotation and reverse rotation of the drive device M, that is, this is the forward and reverse rotation of the drive device M and the needle. This means that the height position of the valve 37 does not change. Therefore, it is possible to suppress hysteresis that occurs between when the valve member 30 is raised and when it is lowered.

さらに、本実施形態では、弁座部材４０がケーシング２０の弁座部材装着孔２２に対して螺合された構成となっており、弁座部材４０が弁座部材装着孔２２内において、螺進或いは螺退させることで、弁座部材４０が軸方向に沿って上下動可能となっている。これにより、弁座部材４０の高さ位置の調整ができ、弁部３７Ａと弁座４１Ａとの当接具合の微調整が可能となっている。   Further, in the present embodiment, the valve seat member 40 is screwed into the valve seat member mounting hole 22 of the casing 20, and the valve seat member 40 is screwed in the valve seat member mounting hole 22. Alternatively, the valve seat member 40 can be moved up and down along the axial direction by being screwed back. Thereby, the height position of the valve seat member 40 can be adjusted, and fine adjustment of the contact state between the valve portion 37A and the valve seat 41A is possible.

＜他の実施形態＞
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれ、さらに、下記以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。
（１）上記実施形態では、押し上げばね６０にコイルバネを用いたが、これに限らず、板バネやゴム等のような弾性を備えたものであればよい。
（２）上記実施形態ではシール部５０にベロフラム５０を用いた構成であったが、ゴムリングを用いたシール部５０であってもよい。
（３）上記実施形態では、ケーシング２０とは別体のナット部材２５を用いたが、ナット部材２５をケーシング２０と一体に形成したものであってもよい。
（４）上記実施形態では、弁座部材４０をケーシング２０と別体に設けたものであったが、弁座部材４０をケーシング２０に一体に形成したものであってもよい。
（５）上記実施形態では、螺合部３１Ｂの雄ねじとナット部材２５の雌ねじとのリード角が１５度に設定されていたが、これに限らず、螺合部３１Ｂに軸方向の荷重が作用た場合に荷重方向に沿って螺進或いは螺退可能なリード角であればよく、例えば、リード角が１５度以上のものであってもよい。 <Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, the coil spring is used as the push-up spring 60. However, the present invention is not limited to this, and any structure having elasticity such as a leaf spring or rubber may be used.
(2) In the above-described embodiment, the configuration is such that the bellophram 50 is used for the seal portion 50, but the seal portion 50 using a rubber ring may be used.
(3) Although the nut member 25 separate from the casing 20 is used in the above embodiment, the nut member 25 may be formed integrally with the casing 20.
(4) In the above embodiment, the valve seat member 40 is provided separately from the casing 20, but the valve seat member 40 may be formed integrally with the casing 20.
(5) In the above embodiment, the lead angle between the male screw of the screwing portion 31B and the female screw of the nut member 25 is set to 15 degrees, but this is not limiting, and an axial load acts on the screwing portion 31B. In this case, the lead angle may be any one that can be screwed or screwed along the load direction. For example, the lead angle may be 15 degrees or more.

流量制御弁の断面図Cross section of flow control valve 流量制御弁の構成部品の断面図Cross-sectional view of components of flow control valve 流量制御弁の構成部品の断面図Cross-sectional view of components of flow control valve 流量制御弁の閉弁状態の断面図Cross section of closed flow control valve 図１のＸ−Ｘ’の断面図Sectional view along X-X 'in FIG. 弁座部材の部破断側面図Partial cutaway side view of valve seat member 雄ねじと雌ねじの螺合状態を示す斜視図The perspective view which shows the screwing state of a male screw and a female screw 駆動装置の駆動軸と回動部の嵌合部との嵌合状態を示す断面図Sectional drawing which shows the fitting state of the drive shaft of a drive device, and the fitting part of a rotation part

符号の説明Explanation of symbols

１０…流量制御弁
２０…ケーシング
２１…弁部材装着孔（装着孔）
２１Ａ…機構室
２１Ｂ…弁収容室
２２…弁座部材装着孔（弁座装着孔）
２５…ナット部材（動力伝達機構）
３０…弁部材
３１…回動部（移動体）
３７…ニードル弁
４０…弁座部材
４１Ａ…弁座
５０…ベロフラム（シール手段）
６０…押し上げばね（付勢手段）
Ｍ…駆動装置（駆動源） DESCRIPTION OF SYMBOLS 10 ... Flow control valve 20 ... Casing 21 ... Valve member mounting hole (mounting hole)
21A ... Mechanism chamber 21B ... Valve housing chamber 22 ... Valve seat member mounting hole (valve seat mounting hole)
25 ... Nut member (power transmission mechanism)
30 ... Valve member 31 ... Rotating part (moving body)
37 ... Needle valve 40 ... Valve seat member 41A ... Valve seat 50 ... Bellofram (sealing means)
60 ... Push-up spring (biasing means)
M ... Drive device (drive source)

Claims (5)

内部に流体の流路が形成されたケーシングと、前記流路の途中に形成された弁座と、この弁座に対し接近あるいは離間することにより前記流体の通過面積を調整可能なニードル弁を備えた弁部材と、この弁部材を軸方向に沿って往復動可能な駆動源とを備え、この駆動源から前記弁部材に対する動力伝達機構中に前記軸方向に沿ったクリアランスが保有されることで前記弁部材に前記クリアランス分に起因した微小変位が発生するものにおいて、
前記弁部材に対し前記軸方向の一方向に作用して前記クリアランスを解消させる付勢手段が設けられていることを特徴とする流量制御弁。 A casing having a fluid flow path formed therein, a valve seat formed in the middle of the flow path, and a needle valve capable of adjusting the fluid passage area by approaching or separating from the valve seat A valve member and a drive source capable of reciprocating the valve member along the axial direction, and a clearance along the axial direction is retained in the power transmission mechanism from the drive source to the valve member. In the case where a minute displacement due to the clearance is generated in the valve member,
The flow control valve according to claim 1, further comprising an urging unit that acts on the valve member in one axial direction to cancel the clearance. 前記動力伝達機構は、前記ケーシングに前記軸方向に沿って形成されたねじ孔と前記ねじ孔に対し前記クリアランスを保有しつつねじ込まれ前記駆動源によってねじ孔内を螺進あるいは螺退可能な移動体とからなるとともに、前記弁部材はこの移動体とは前記軸方向に沿って連動可能であることを特徴とする請求項１記載の流量制御弁。 The power transmission mechanism is a screw hole formed in the casing along the axial direction and is screwed into the screw hole while retaining the clearance, and can be screwed or screwed through the screw hole by the drive source. 2. The flow rate control valve according to claim 1, wherein the valve member is interlocked with the movable body along the axial direction. 前記ケーシングの内部には前記流路に連通し前記軸方向に沿った装着孔が形成される一方、前記弁部材には同弁部材の軸方向の移動を許容しつつ前記装着孔内を前記ニードル弁を収容する弁収容室と前記移動体側を収容する機構室とに区画するシール手段が備えられていることを特徴とする請求項２記載の流量制御弁。 A mounting hole is formed in the casing so as to communicate with the flow path along the axial direction, while the valve member allows the needle member to move in the axial direction while allowing the valve member to move in the axial direction. 3. The flow rate control valve according to claim 2, further comprising a sealing means for partitioning a valve accommodating chamber for accommodating a valve and a mechanism chamber for accommodating the movable body side. 前記弁座は前記ケーシングと別体に設けられると共に、前記ケーシングに対して前記弁部材の軸方向に移動可能に組みつけられることを特徴とする請求項１から請求項３のいずれかに記載の流量制御弁。 The valve seat is provided separately from the casing, and is assembled to the casing so as to be movable in the axial direction of the valve member. Flow control valve. 前記弁座は前記ケーシングに設けられて軸方向に沿ってねじ孔が螺設された弁座装着孔との螺合動作によって前記弁部材の軸方向に移動可能となることを特徴とする請求項４に記載の流量制御弁。 The valve seat is movable in the axial direction of the valve member by a screwing operation with a valve seat mounting hole provided in the casing and screwed in a screw hole along the axial direction. 4. The flow control valve according to 4.
JP2003389626A 2003-11-19 2003-11-19 Flow control valve Pending JP2005147363A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007182819A (en) * 2006-01-10 2007-07-19 Otics Corp Oil jet for cooling piston
JP2008202620A (en) * 2007-02-16 2008-09-04 Tlv Co Ltd Free float type drain trap
KR100876120B1 (en) 2007-04-20 2008-12-26 주식회사 티에프씨 Hot water dispenser
CN114645961A (en) * 2020-12-21 2022-06-21 株式会社鹭宫制作所 Pressure regulating valve

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JPS6187273U (en) * 1984-11-14 1986-06-07
JPH03117182U (en) * 1990-03-13 1991-12-04
JPH0651641U (en) * 1992-12-16 1994-07-15 日本酸素株式会社 Open / close valve
JPH0821556A (en) * 1994-07-06 1996-01-23 Fuji Koki Seisakusho:Kk Motor-driven flow control valve
JPH09257147A (en) * 1996-03-21 1997-09-30 Fuji Koki:Kk Motor operated valve
JP2003021252A (en) * 2001-07-05 2003-01-24 Smc Corp Flow rate control valve
JP2004052653A (en) * 2002-07-19 2004-02-19 Keihin Corp Exhaust gas recirculating valve

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JPS6187273U (en) * 1984-11-14 1986-06-07
JPH03117182U (en) * 1990-03-13 1991-12-04
JPH0651641U (en) * 1992-12-16 1994-07-15 日本酸素株式会社 Open / close valve
JPH0821556A (en) * 1994-07-06 1996-01-23 Fuji Koki Seisakusho:Kk Motor-driven flow control valve
JPH09257147A (en) * 1996-03-21 1997-09-30 Fuji Koki:Kk Motor operated valve
JP2003021252A (en) * 2001-07-05 2003-01-24 Smc Corp Flow rate control valve
JP2004052653A (en) * 2002-07-19 2004-02-19 Keihin Corp Exhaust gas recirculating valve

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007182819A (en) * 2006-01-10 2007-07-19 Otics Corp Oil jet for cooling piston
JP4527061B2 (en) * 2006-01-10 2010-08-18 株式会社オティックス Oil jet for piston cooling
JP2008202620A (en) * 2007-02-16 2008-09-04 Tlv Co Ltd Free float type drain trap
KR100876120B1 (en) 2007-04-20 2008-12-26 주식회사 티에프씨 Hot water dispenser
CN114645961A (en) * 2020-12-21 2022-06-21 株式会社鹭宫制作所 Pressure regulating valve
CN114645961B (en) * 2020-12-21 2023-11-07 株式会社鹭宫制作所 pressure regulating valve

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